By Rob Lenihan Volunteer groups and NGOs have collectively received funds totaling just over $570,000, a new study finds, much of it over the past year. Facing the threat of a Russian invasion, Ukrainians are raising thousands of dollars for volunteer groups by crowdfunding bitcoin, a new study found. Bitcoin has emerged as an important alternative funding method for volunteer groups, according to a study by Elliptic, allowing international donors to bypass financial institutions that are blocking payments to these groups. Elliptic identified several cryptocurrency wallets used by volunteer gr…